Engine Idle Drops A Lot in D
I also forgot to mention. I can get more vacuum with more timing. Just not sure if I should advance up to 25°.
Sorry for the inexperience guys. Really appreciate the help.
Understand that what you have at idle is the initial timing (assuming the distributor mechanical advance is not coming in at idle, which it should no do.) As you increase the revs, the mechanical advance is going to start adding in. The stock mechanical advance is 22*, so if you have 25* initial, then you would have 47* total when the mechanical advance all came in, and that is usually considered certainly waaay too much under WOT conditions. A total in the 30-35 range is typically good; some have used more, but that seems to be in the case of lower compression engines. (Too much and the engine detonates.) So at 20* initial, you may already be where you need to limit the mechanical advance.
There are ways like adjustable stop plates to limit the mechanical advance if you need to run much past 15* initial. But, with your decent CR and cam, I don't think you need to go with so much initial timing. There are plenty of very knowledgeable discussions and people here on that matter.
You have the PCV and other things to correct first. So IMHO, don't further complicate your situation with too much advance. Save that as one of the last steps in the process.
As a point of interest, was your cam 'degreed' when it was installed? If so, do you have the ICL (intake centerline) angle? That info may help in understanding if your idle vacuum levels are in the right neighborhood.